Cong Wang <xiyou.wangc...@gmail.com> writes: > According to the comments, we need to test if this is > the first throttled task, however, list_empty() tests on > the entry cfs_rq->throttled_list, not the head, this is wrong. > > This is a bug because we don't re-init the list entry after > removing it from the list, so list_empty() could return false > even if the list is really empty. > > Cc: Ingo Molnar <mi...@redhat.com> > Cc: Peter Zijlstra <pet...@infradead.org> > Signed-off-by: Cong Wang <xiyou.wangc...@gmail.com> > Signed-off-by: Cong Wang <cw...@twopensource.com>
Agreed. Reviewed-by: Ben Segall <bseg...@google.com> > --- > kernel/sched/fair.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c > index 40a7fcb..ee91917 100644 > --- a/kernel/sched/fair.c > +++ b/kernel/sched/fair.c > @@ -3683,7 +3683,7 @@ static void throttle_cfs_rq(struct cfs_rq *cfs_rq) > cfs_rq->throttled = 1; > cfs_rq->throttled_clock = rq_clock(rq); > raw_spin_lock(&cfs_b->lock); > - empty = list_empty(&cfs_rq->throttled_list); > + empty = list_empty(&cfs_b->throttled_cfs_rq); > > /* > * Add to the _head_ of the list, so that an already-started -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
